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Physics

Physics
How much mechanical work must be done to completely melt 1 gram of ice at 0°C ?

4.2 J
80 J
336 J
2268 J

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Physics
Which one of the following processes is responsible for the glittering of air bubble rising through water?

Reflection of light
Refraction of light
Scattering of light
Total internal reflection of light

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Physics
A copper wire of radius r and length l has a resistance of R. A second copper wire with radius 2r and length l is taken and the two wires are joined in a parallel combination. The resultant resistance of the parallel combination of the two wires will be

R/5
5 R/4
5 R
4 R/5

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Physics
The shape of our milky way galaxy is

Elliptical
None of these
Circular
Spiral

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Physics
Which of the following metals is used for the manufacture of heating elements provided in electric iron ?

Tungsten
Nichrome
Nickel
Chromium

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Physics
A mass of 20 kg is at a height of 8 m above the ground. Then the potential energy possessed by the body is: [Given g = 9.8 m/s2]

1568 J
1568 C
1568 N
1568 W

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